package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    private final OrderMapper orderMapper;
    private final OrderDetailMapper orderDetailMapper;
    private final AddressBookMapper addressBookMapper;
    private final ShoppingCartMapper shoppingCartMapper;
    private final WebSocketServer webSocketServer;

    @Autowired
    public OrderServiceImpl(OrderMapper orderMapper, OrderDetailMapper orderDetailMapper, AddressBookMapper addressBookMapper, ShoppingCartMapper shoppingCartMapper, WebSocketServer webSocketServer) {
        this.orderMapper = orderMapper;
        this.orderDetailMapper = orderDetailMapper;
        this.addressBookMapper = addressBookMapper;
        this.shoppingCartMapper = shoppingCartMapper;
        this.webSocketServer = webSocketServer;
    }

    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //处理业务异常
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询用户购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> cartList = shoppingCartMapper.list(shoppingCart);
        if (cartList == null || cartList.isEmpty()) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入一条数据
        Orders order = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, order);
        order.setOrderTime(LocalDateTime.now());
        order.setPayStatus(Orders.UN_PAID);
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setNumber(String.valueOf(System.currentTimeMillis()));
        order.setPhone(addressBook.getPhone());
        order.setConsignee(addressBook.getConsignee());
        order.setUserId(userId);
        order.setAddress(addressBook.getFullAddress());
        orderMapper.insert(order);

        //向订单明细表插入多条数据
        List<OrderDetail> list = new ArrayList<>();
        for (ShoppingCart cart : cartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(order.getId());
            list.add(orderDetail);
        }
        orderDetailMapper.insertBatch(list);

        //清空当前用户的购物车
        shoppingCartMapper.deleteByUserId(userId);

        //封装返回结果
        return OrderSubmitVO.builder()
                .id(order.getId())
                .orderTime(order.getOrderTime())
                .orderNumber(order.getNumber())
                .orderAmount(order.getAmount())
                .build();
    }

    /**
     * 订单支付
     * @param ordersPaymentDTO 支付信息
     * @return 支付返回结果
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        // 替代微信支付成功后的数据库订单状态更新，直接在这里更新了
        // 根据订单号查询当前用户的该订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(ordersPaymentDTO.getOrderNumber(), userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.TO_BE_CONFIRMED);
        orders.setPayStatus(Orders.PAID);
        orders.setCheckoutTime(LocalDateTime.now());

        orderMapper.update(orders);

        JSONObject json = new JSONObject();
        json.put("type", 1);
        json.put("orderId", ordersDB.getId());
        json.put("content", "订单号" + ordersDB.getNumber());
        webSocketServer.sendToAllClient(json.toJSONString());
        return vo;
    }

    @Override
    public void paySuccess(String outTradeNo) {
        //
    }

    @Override
    public PageResult<OrderVO> pageQuery4User(int page, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(page, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> res = orderMapper.selectPage(ordersPageQueryDTO);

        List<OrderVO> list = getOrderVOList(res);
        return new PageResult<>(res.getTotal(), list);
    }

    @Override
    public OrderVO detail(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);

        // 查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    @Override
    public void userCancelById(Long id) {
        Orders orderDB = orderMapper.getById(id);
        // 判断当前订单是否存在
        if (orderDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (orderDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders order = new Orders();
        order.setId(orderDB.getId());

        // 订单处于待接单状态下取消，需要进行退款
        if (orderDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            order.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        order.setStatus(Orders.CANCELLED);
        order.setCancelReason("用户取消");
        order.setCancelTime(LocalDateTime.now());
        orderMapper.update(order);
    }

    @Override
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    @Override
    public PageResult<OrderVO> conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.selectPage(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult<>(page.getTotal(), orderVOList);
    }

    @Override
    public OrderStatisticsVO statistics() {
        // 根据状态，分别查询出待接单、待派送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        // 将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }

    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        // 查询出当前订单
        Orders ordersDB = orderMapper.getById(ordersConfirmDTO.getId());
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        // 判断当前订单状态是否为待接单
        if (!ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        // 查询出当前订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        // 判断当前订单状态是否为待接单
        if (!ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        if (ordersDB.getPayStatus().equals(Orders.PAID)){
            //微信退款
            log.info("微信退款");
        }

        Orders orders = Orders.builder()
                .id(ordersRejectionDTO.getId())
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .status(Orders.CANCELLED)
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        if (ordersDB.getPayStatus().equals(Orders.PAID)){
            //微信退款
            log.info("微信退款");
        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = Orders.builder()
                .id(ordersCancelDTO.getId())
                .cancelReason(ordersCancelDTO.getCancelReason())
                .status(Orders.CANCELLED)
                .cancelTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void delivery(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //如果订单未确认，则无法进行派送，抛出异常
        if (!ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void complete(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //如果订单未派送，则无法进行完成，抛出异常
        if (!ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    @Override
    public void remind(Long id) {
        // 查询出当前订单
        Orders ordersDB = orderMapper.getById(id);
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        JSONObject json = new JSONObject();
        json.put("type", 2);
        json.put("orderId", ordersDB.getId());
        json.put("content", "订单号" + ordersDB.getNumber());
        webSocketServer.sendToAllClient(json.toJSONString());
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);
                String orderDishes = getOrderDishesStr(orderDetails);
                orderVO.setOrderDishes(orderDishes);

                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    private String getOrderDishesStr(List<OrderDetail> orderDetails) {
        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetails.stream().map(
                x -> x.getName() + "*" + x.getNumber() + ";"
        ).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

}
